53
Wall Cases and Grilles are needed for new installations
Alternate specification for steel wall case.
Wall case
shall be constructed of heavy gauge, zinc-coated,
phosphated steel, insulated and shall have a protective
baked-on enamel finish. Bottom critical points of the steel
wall case shall be treated with petroleum microcrystalline
wax for added corrosion protection and shall meet ASTM
B-117, 1800 hour hot air aerated salt spray test.
Alternate specification for molded wall case.
Wall case
shall be constructed of a non-corroding fiberglass
reinforced polyester compound.
Cases shall be installed through exterior walls where shown
on the plans and shall be installed per manufacturer’s
installation instructions. In no instance shall fasteners be
used through the bottom in order to retain the water
integrity of the bottom of the wall case.
Outside weather panels shipped with the cases shall remain
in place until the outdoor air louvers and chassis are
installed, at which time they are to be removed and
discarded by the installer.
Outside Grille
. Each unit shall be equipped with a standard
exterior grille that has been designed to allow unit operation
in high ambient conditions. Grilles shall be of material and
design specified.
Special grilles or customer louver sections to be supplied by
others will conform to minimum free area requirements for
unit performance and shall be submitted to the
PTAC/PTHP manufacturer, if requested, for feasibility and
airflow characteristics.
Specifications for Sub-base (if required).
Sub-Base.
Each unit shall have a field installed UL listed
electrical sub-base. The sub-base shall be attached to the
lower inside flange of the wall case prior to installation in
the exterior wall and shall include adjustable screws at the
bottom corners to permit exact leveling of the wall case. The
sub-base shall have a factory installed receptacle to allow
unit line cord to plug into mating receptacle and shall have
a chaseway to contain and conceal the line cord. The sub-
base shall have side panels adjustable from a minimum of
2 3/8" to a maximum of 13 3/4" to enclose the area under
the wall case.
Weather Resistance.
Complete unit including outside louver
shall be submitted to an independent agency for weather
resistance and water infiltration tests.
Air infiltration test to be conducted in accordance with
ASTM E283-91. With static air pressure differential of 1.57
lb./ft.
2
(.3" H
2
O) equivalent to 25 mph wind, allowable air
infiltration shall not exceed 7 ft.
3
/min.
Water infiltration test to be conducted in accordance with
ASTM E331-86 with static air pressure differential of 10.0
lb./ft
2
(1.93" water) equivalent to 63 mph wind, 5.0 gal./ft.
2
(8" rain/ft.
2
/hr.) for 15 minutes and there shall be no
leakage into the room.
Approvals
. Units shall be certified under the ARI and cUL
certification program and listed by UL.
Service
. Submit complete information with bid covering
service availability, to whom service on units will be assigned,
complete address and phone number, including phone
number of emergency service personnel.
Start-Up, Adjust, Demonstrate
. Contractor shall be
responsible for the initial starting of units, adjustments
thereto, etc., to place the units in required operating
condition. Contractor shall demonstrate to the owner, or his
representative, the operation of units for both summer and
winter functions.
Warranty
. The warranty shall be a full one year parts and
labor on entire unit plus an additional full four years parts
and labor for the sealed refrigerating system, including
service call for diagnosis, and transportation to and from
service shop, if necessary, at no charge to customer. The
warranty shall also include a limited 2nd thru 5th year parts
only warranty for fan motors, switches, thermostat, heater,
heater protectors, compressor overload, solenoids, circuit
boards, auxiliary controls, thermistors, frost controls, ICR
pump, capacitors, varistors, and indoor blower bearing.
Installation Responsibility.
Units shall be installed according
to the manufacturer’s recommendations and the
manufacturer shall not be responsible for unit failure as a
result of improper installation, or unit performance when
installed with accessories not approved by the manufacturer.
1719 Data Manual 2001 2/14/02 3:12 PM Page 53
